Cannot send email with `symfony/mailer`, but native function `mail` works

I have a server configured with DKIM and the native mail function seems to respect that and sends out emails without a problem.

However, I need to use symfony/mailer (wrapped by yiisoft/yii2-symfonymailer) and I cannot get it to work. If I use the default SmtpTransport, I get the following error:

550-Verification failed for <XXXX>
550-Unrouteable address
550 Sender verify failed

If I use the built-in transport native://default it fails silently (as expected).

Any idea what I can do here? How can I get to the bottom of this? I’m about to write my own Transport class which simply uses mail, but that’s obviously kind of ridiculous…

Thank you!

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